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Human Reproduction

Question
CBSEENBI12003374

During menstrual cycle, levels of LH and estrogen are highest around

  • 14day

  • 21day

  • 7day

  • 28day

Solution

A.

14day

The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of the cycle (about 14 day). Rapid secretion ofLH leading to its maximum level during mid-cyclecalled LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). Concentration of estrogen in blood is also high around 14 day and reaches its peak.